Ok Duke I am with you 100% now. Same reason that deer will bed up high on a ridge during the day and look downhill.... thermals carrying the wind from the top of the hill down and the deer himself looking where is nose cannot detect danger.
Sorta.. wind would be at a bucks back.. so he can see what he can't smell due to the prevailing wind.
Again.. trying to use at least 2 of his senses to survive.